Ejector assembly



Nov. 29, 1949 Jhw, GURLEY 2,489,636

EJECIOR ASSEMBLY Filed 001,. 24, l946. 3 Sheets-Sheet l FlG l" INVENTOR JOHN w. GURLEY BY Foul/min gbwtmin ATTORN EYS Nov. 29, 1949 J. w. GURLEY EJECTOR ASSEMBLY 3 Sheets-Sheet 3 Filed Oct. 24, 1946 INVENTOR JOHN w. GURLEY BY gowembn Jouhd/n I l l //1 ATTORNEYS Patented Nov. 29, 1949 rircroa ASSEMBLY John W. Gurley, Dayton, Ohio, assignor to. The Duro, Company, Dayton, Ohio, a corporation of Ohio Application October 24, 1946, Serial Nq. 705,459

This invention relates to ejectors and mountings therefor, and especially to ejectors for fluid pumps such as shallow I and deep well water pumps.

The operation of the usual type water pump is generally enhanced by the use of an ejector whereby the pump is self-priming, creates a greater suction, and is enabled to pump liquids from much greater depths. An ejector of this type comprises an axially alignedjet or nozzle and Venturi tube or diffuser, the jet discharging into the throat of the Venturi, and the suction conduit also being connected with the Venturi throat. The other end of the Venturi is connected to the inlet of the pump and the discharge side of the pump is connected jointly with the nozzle and with a discharge line.

Heretofore, it has been customary to form in one piece the receiver for both the jet and the .Venturi tube. o to tilize. the Ven ri. t e as.

ne of th s ructura members of th p ping a mhly. In most instan e t was necessary to locate. the nozzl wi hin the memb r wh h received the Venturi tu e s that r m al. of the nozzle was diificult excep with. special. to lsv s ch as ocket wrenches. F rthermore. th Ve turi tube was in dan r oi being harmed due to the stresses thereon when it was used as a structural member.

A particular object of the present invention is to provide an improved mounting means for the Venturi tube in an ejector type pumping system wherein all stresses are removed from the said tube.

A still further object is to provide an improved type mounting for a Venturi tube in an ejector type pumping system which permits the formingthe Venturi tube and by means of which the manufacture of the jet supporting member is greatly simplified.

It is a still further object to provide a means according to any of the foregoing objects which is universally useful in both deep and shallow well pumping systems.

8 Claims. (Cl. 1039-260) These and other objects and advantages will become more apparent upon reference to the following description and the accompanying drawings in which:

Figure 1 is a view showing a pumping systenr constructed according to this invention;

Figure 2 is an enlarged vertical section of the arrangement show-min Figure 1; and which indicated by the line 2- -2 on Figure 1 Figure 3 is a perspective view of the adapter of this invention which mounts the Venturi tube; and

Figure 4 is a view similar to Figure 2 by showing a double tube.

Referring to the drawings, Figure 1 shows a, P m n sy m ons in f a um l w ich is connected by a shaft and coupling indicated at l 2 to be driven by a motor such as the electric motor I4. The um y e of any u tab e. WP? s s a cent tus t pe p m nd will suffice for the purpose of this disclosure tc. refer to it as a pressure pump. The pump II; has an inlet conduit i6 connected therewith and discharges through an outlet fitting It to which is connected the discharge conduit. 20.

The discharge conduit 20 may have connected therewith, as by the conduit means 2s a suitable. pressure indicating gauge 24 and a pressure switch, not shown. which controls the operation of the motor I 4.

The inlet conduit l6 of the pump in is con-v nected with a fitting 2 6 which supports an inner conduit 28 and a concentric outer conduit 3!! which depend toward the liquid level in a well generally indicated at 32. The conduit 30 ex-l tends into the liquid within the well while the conduit 28 ends short of the bottom of the 0.0. duit 30 and has connected therewith a fitting or adapter 34. The adapter 34 supports a Venturi tube 36 within the conduit '28 and also supports a fitting generally indicated at 38 through which liquid is drawn from the well via a foot valve 40 and strainer 42.

Referring to Figure 2, the Venturi tube and the parts associated therewith are more clearly seen. In this fi e it will be noted that the Venturi tube 36 is supported solely by being threaded into a recess in the upperend of the adapter member 34, the outer part of the upper end of the said adapter member being threaded as at 44 to receive the end of the conduit 28.

Beneath the end of the conduit 28 the adapter member 34 is enlarged and is internally threaded to receive the threaded upper end of the fitting 38. In the upper end of the fitting 38 is a threadmember 34 mounts the Venturi tube 35 and encloses the jet or nozzle 46 which is carried in the upper end of a fitting B4. The fitting 64 includes a passage 66 leading from the chamber formed by the adapter member 34 to a suction conduit 68 which extends into the liquid to be pumped. The member 64 also includes a passage ll! communicating with the inside of the jet 46 and terminating in a threaded port 12 which receives a conduit 14 that leads to the discharge side of the pump 60. Another conduit 16 leading from The lower end of the member 38 is hollow, as i 7 indicated by the passage 55,'and communicates directly with the liquid inthe well through the foot valve and strainer. The passage 55 at its upper end divides into two passages, one of which is indicated by the dotted lines at 5B in Figure 2, and which communicate with the conical chamber formed by the member 34 in the lower end of the Venturi tube 36.

, Referring again to Figure 1, it will be noticed that the member 26 is adapted for receiving the end of a conduit 58 which is connected, by a.

means not shown, with the discharge side of the pump I to receive pressure fluid therefrom. The pressure fluid passing through the conduit 8 from the pump flows downwardly within the conduit 39 and is directed upwardly through the jet 46 into the throat of the venturi or diffuser 36. This creates a suction in the chamber at the base of the venturi and draws the water from the well upwardly through the passage 55 into the Venturi tube, and thence through the conduit 28 into the inlet side of the pump I'll.

It will be noted that the weight of the member 38, the foot valve and strainer, and other parts connected therewith are carried by the adapter member 34 and inner conduit 28, and that there are no stresses on the Venturi tube or the nozzle 46. Thus, any material which will reasonably withstand the erodin action of the liquid flowing through the pump and particles of foreign material carried thereby is suitable for use in the nozzle and in the Venturi tube. Among such substances are various plastic materials such as Bakelite, polystyrene, the ureas, etc., as well as glass, porcelain and other ceramics, and some metals and alloys which do not possess surficient strength to be employed as structural members.

It will be apparent that the arrangement of this invention substantially simplifies the manufacture of the Venturi tube and nozzle because it enables them to be molded by high speed production methods rather than machined out from solid metals.

It will also be noted that the ejector assembly, comprising the jet and Venturi tube, is readily disassembled, and that no special wrenches are required for removing the jet portion. Rather, the adapter member 34 is removed and thereafter an automatic wrench can be employed for removing the jet 46. It should also be noted that the adapter member 34 completes the channel connecting the suction conduit leading to the well with the inlet end of the Venturi tube;

By so utilizing the adapter member, the forming ber 34 of this invention. As before, the adapter the discharge side of the pump carries the pumped fluid therefrom.

' It will be noted that both of the arrangements in Figures 2 and 4 have the features of this invention in that the Venturi tube does not form a structural member in the sense that it is required to support a load'and, therefore, may be manufactured from any suitable material irrespective of its structural strength. Both of the arrangements shown also include the feature of fully exposing the jet or nozzle when the adapter member 34 is removed thereby to simplify inspection or replacement of the jet or nozzle. Furthermore, both of the arrangements in Figures 2 and 4 have the upper portion of their suction conduits between the well and Venturi tube completed by the adapter member 34 so that the fitting which carries the nozzle is of a substantially simpler form thereby reducing the complexity of the coring thereof when the said fitting is cast.

It will be understood that this invention is susceptible to modification in order to adapt it todifferent usages and conditions and, accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope of the appended claims.

I claim:

1. In a jet pump; a nozzle; a member having the nozzle supported in the end thereof and having a suction passage opening around the periphcry of said nozzle and a pressure passage opening into the interior of said nozzle; a diffuser in alignment with said nozzle; an adapter supporting said diffuser and carried by said member; a first conadapter member secured to the end of said fitting and surrounding said nozzle; means in the other end of said adapter member for detachably receiving said diffuser tube; and sealing means carried by said member for sealing the same within a conduit.

3. In a jet pump; an axially aligned nozzle and diffuser tube; a fitting; means detachably supporting said nozzle in the end of said fitting; an adapter member secured to the end of said fitting and surrounding said nozzle; means in the other end of said adapter member for detachably receiving'said diffuser tube; other means at the said other end of said adapter member for detachably receiving the conduit into which said diffuser tube discharges; and gasket means on the body of said fitting for sealing the same within a conduit.

4. In a jet pump; concentric conduit means extending into a liquid supply, the inner of said conduit means being shorter than the outer of said conduits; a fitting sealed in the outer conduits and below the end of the inner conduit; a nozzle mounted in the upper end of said fitting; passage means connecting the lower end of the outer conduit with the periphery of said nozzle; other passage means connecting the interior of said nozzle with the space between said conduits; an adapter screw-threadedly connected with said fitting and with said inner conduit for directly supporting said fitting thereon; and a diffuser tube mounted in said adapter and extending into said inner conduit.

5. In a jet pump; concentric conduit means extending into a liquid supply, the inner of said conduit means being shorter than the outer of said conduit means; a fitting sealed in the outer of said conduits and below the end of the inner conduit; a nozzle mounted in the upper end of said fitting; passage means connecting the lower end of the outer conduit with the periphery of said nozzle; other passage means connecting the interior of said nozzle with the space between said conduits; an adapter screw-threadedly connected with said fitting and with said inner conduit for directly supporting said fitting thereon; and a diffuser tube mounted in said adapter and extending into said inner conduit, said adapter completing the suction passage from around the periphery of said nozzle into the receiving end of said diffuser.

6. In a jet pump; concentric conduits adapted for extending into a liquid supply, the inner of said conduits being shorter than the outer of said conduits; a fitting mounted in the outer conduit and below the end of the inner conduit; a nozzle mounted in the upper end of said fitting; said fitting having passage means connecting the lower end of the outer conduit with the periphery of said nozzle and also connecting the interior of said nozzle with the space between said conduits; an adapter screw-threadedly connected with said fitting and with said inner conduit for directly supporting said fitting thereon;

and a diffuser tube mounted in said adapter and extending into said inner conduit.

7. In a jet pump; concentric conduits adapted for extending into a liquid supply, the inner of said conduits being shorter than the outer of said conduits; a fitting mounted in the outer conduit and below the end of the inner conduit; a nozzle mounted in the upper end of said fitting; said fitting having passage means connecting the lower end of the outer conduit with the periphery of said nozzle and also connecting the interior of said nozzle with the space between said conduits; an adapter screw-threadedly connected with said fitting and with said inner conduit for directly supporting said fitting thereon; a diffuser tube mounted in said adapter and extending into said inner conduit; and sealing means between said fitting and the outer of said conduits.

8. In an ejector assembly for pumps; a nozzle; a member detachably supporting said nozzle and having a suction passage therein opening at the periphery of said nozzle and a pressure passage therein opening into the center of said nozzle; a diffuser tube in axial alignment with the discharge end of said nozzle; a suction conduit surrounding said difiuser tube; and means of supporting said diffuser tube and said suction conduit comprising an adapter screw-threaded to said conduit and to said member and detachably supporting said diffuser tube, said adapter having a passage therein to join the suction passage in said member with the passage in said difiuser.

JOHN W. GURLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,791,292 Smith Feb. 3, 1931 1,791,513 Slocum Feb. 10, 1931 2,080,622 McMahon May 18, 1937 2,133,269 Berman et a1. Oct. 18, 1938 2,246,416 Church June 17, 1941 

